The important parts :
Config Osc = disabled, 32mhzosc = Enabled ,[b:e65af005f5] 32khzosc = enabled[/b:e65af005f5]
Config Sysclock = 32mhz , Prescalea = 1 , Prescalebc = 1_1
[b:e65af005f5] OSC_DFLLCTRL.0 = 1
DFLLRC32M_CTRL.0 = 1[/b:e65af005f5]
above code is sufficient to use DFFL calibration. It will use internal 32 Khz xtal.
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